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Background: Calcyclin is a member of the S100 subfamily of EF-hand Ca 2+ -binding proteins. This protein has implied roles in the regulation of cell growth and division, exhibits deregulated expression in association with cell transformation, and is found in high abundance in certain breast cancer cell lines. The novel homodimeric structural motif first identified for apo calcyclin raised...
Barstar, a polypeptide inhibitor of ribonucleases, has been studied by 2D and 3D NMR techniques using uniformly 15 N-labeled protein. Backbone ( 15 NH-C α H-C β H) resonances were assigned for all but 5 of the 89 residues. Dihedral angle and deuterium exchange studies were used in conjunction with medium range inter-proton NOEs to characterize the secondary...
The extracellular ribonuclease from Bacillus amyloliquifaciens, barnase, forms a tightly-bound one-to-one complex with its intracellular inhibitor barstar. The barstar binding site on barnase was characterised by comparing the differences in the chemical shift and hydrogen-deuterium exchange rates between free and bound barnase. Chemical shift assignments of barnase in the complex with barstar were...
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